m−1/3= 2m − 7
options:
m = 6
m = 4
m = 5
m = -3
(m - 1)/3 = 2m - 7 multiply through by 3
m - 1 = 6m - 21 add 21 to both sides, subtract m from both sides
20 = 5m divide both sides by 5
4 = m
